地质通报2012，Vol.31Issue(12)：2032-2037,6.
甘肃北山地区牛圈子蛇绿岩的形成时代及地质意义
The age of Niujuanzi ophiolite in Beishan area of Gansu Province and its geological significance
摘要
Abstract
In order to study the age of Xichangjing-Niujuanzi-Hongliuhe ophiolite belt in Beishan area of Gansu Province, the authors conducted zircon LA—ICP—MS U—Pb dating of gabbro from this ophiolite belt. The result shows that the weighted average 206Pb/238U age of this ophiolite is 446.5 Ma±4Ma, suggesting late Ordovician. In combination with previous researches, the authors hold that Niujuanzi ophiolite and Hongliuhe ophiolite should be the products of early Paleozoic Ocean evolution. This study is of important significance for the study of tectonic evolution in Beishan area during early Paleozoic period.关键词
甘肃北山/LA-ICP-MS锆石U-Pb定年/牛圈子蛇绿岩Key words
Beishan area of Gansu /LA-ICP-MS zircon U-Pb dating/Niujuanzi ophiolite分类
天文与地球科学引用本文复制引用
武鹏,王国强,李向民,余吉远,康磊..甘肃北山地区牛圈子蛇绿岩的形成时代及地质意义[J].地质通报,2012,31(12):2032-2037,6.基金项目
中国地质调查局地质调查项目《北山-祁连成矿带地质矿产综合研究》(编号:1212011085077)、《北祁连成矿带成矿条件研究与找矿靶区优选》(编号:1212010818090) （编号:1212011085077）
